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Other Current Assets - Additional Information (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Assets Current [Line Items] |  |
Prepaid expenses | $ 471,686 | $ 582,616
Directors and Officers Insurance [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | 316,795 | 260,321
Marine Insurance [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | 67,447 | 132,316
Professional Services [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | 75,784 | 166,389
Other Insurances [Member] |  |
Other Assets Current [Line Items] |  |
Prepaid expenses | $ 11,660 | $ 23,590

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